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fe898f56 DC |
1 | /* Block-related functions for the GNU debugger, GDB. |
2 | ||
0b302171 | 3 | Copyright (C) 2003, 2007-2012 Free Software Foundation, Inc. |
fe898f56 DC |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
fe898f56 DC |
10 | (at your option) any later version. |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
fe898f56 DC |
19 | |
20 | #include "defs.h" | |
21 | #include "block.h" | |
22 | #include "symtab.h" | |
23 | #include "symfile.h" | |
9219021c DC |
24 | #include "gdb_obstack.h" |
25 | #include "cp-support.h" | |
801e3a5b | 26 | #include "addrmap.h" |
8e3b41a9 JK |
27 | #include "gdbtypes.h" |
28 | #include "exceptions.h" | |
9219021c DC |
29 | |
30 | /* This is used by struct block to store namespace-related info for | |
31 | C++ files, namely using declarations and the current namespace in | |
32 | scope. */ | |
33 | ||
34 | struct block_namespace_info | |
35 | { | |
36 | const char *scope; | |
37 | struct using_direct *using; | |
38 | }; | |
39 | ||
40 | static void block_initialize_namespace (struct block *block, | |
41 | struct obstack *obstack); | |
fe898f56 DC |
42 | |
43 | /* Return Nonzero if block a is lexically nested within block b, | |
44 | or if a and b have the same pc range. | |
4a64f543 | 45 | Return zero otherwise. */ |
fe898f56 DC |
46 | |
47 | int | |
0cf566ec | 48 | contained_in (const struct block *a, const struct block *b) |
fe898f56 DC |
49 | { |
50 | if (!a || !b) | |
51 | return 0; | |
edb3359d DJ |
52 | |
53 | do | |
54 | { | |
55 | if (a == b) | |
56 | return 1; | |
49e794ac JB |
57 | /* If A is a function block, then A cannot be contained in B, |
58 | except if A was inlined. */ | |
59 | if (BLOCK_FUNCTION (a) != NULL && !block_inlined_p (a)) | |
60 | return 0; | |
edb3359d DJ |
61 | a = BLOCK_SUPERBLOCK (a); |
62 | } | |
63 | while (a != NULL); | |
64 | ||
65 | return 0; | |
fe898f56 DC |
66 | } |
67 | ||
68 | ||
69 | /* Return the symbol for the function which contains a specified | |
7f0df278 DJ |
70 | lexical block, described by a struct block BL. The return value |
71 | will not be an inlined function; the containing function will be | |
72 | returned instead. */ | |
fe898f56 DC |
73 | |
74 | struct symbol * | |
7f0df278 | 75 | block_linkage_function (const struct block *bl) |
fe898f56 | 76 | { |
edb3359d DJ |
77 | while ((BLOCK_FUNCTION (bl) == NULL || block_inlined_p (bl)) |
78 | && BLOCK_SUPERBLOCK (bl) != NULL) | |
fe898f56 DC |
79 | bl = BLOCK_SUPERBLOCK (bl); |
80 | ||
81 | return BLOCK_FUNCTION (bl); | |
82 | } | |
83 | ||
f8eba3c6 TT |
84 | /* Return the symbol for the function which contains a specified |
85 | block, described by a struct block BL. The return value will be | |
86 | the closest enclosing function, which might be an inline | |
87 | function. */ | |
88 | ||
89 | struct symbol * | |
90 | block_containing_function (const struct block *bl) | |
91 | { | |
92 | while (BLOCK_FUNCTION (bl) == NULL && BLOCK_SUPERBLOCK (bl) != NULL) | |
93 | bl = BLOCK_SUPERBLOCK (bl); | |
94 | ||
95 | return BLOCK_FUNCTION (bl); | |
96 | } | |
97 | ||
edb3359d DJ |
98 | /* Return one if BL represents an inlined function. */ |
99 | ||
100 | int | |
101 | block_inlined_p (const struct block *bl) | |
102 | { | |
103 | return BLOCK_FUNCTION (bl) != NULL && SYMBOL_INLINED (BLOCK_FUNCTION (bl)); | |
104 | } | |
105 | ||
801e3a5b JB |
106 | /* Return the blockvector immediately containing the innermost lexical |
107 | block containing the specified pc value and section, or 0 if there | |
108 | is none. PBLOCK is a pointer to the block. If PBLOCK is NULL, we | |
109 | don't pass this information back to the caller. */ | |
fe898f56 DC |
110 | |
111 | struct blockvector * | |
714835d5 | 112 | blockvector_for_pc_sect (CORE_ADDR pc, struct obj_section *section, |
801e3a5b | 113 | struct block **pblock, struct symtab *symtab) |
fe898f56 | 114 | { |
b59661bd AC |
115 | struct block *b; |
116 | int bot, top, half; | |
fe898f56 DC |
117 | struct blockvector *bl; |
118 | ||
119 | if (symtab == 0) /* if no symtab specified by caller */ | |
120 | { | |
121 | /* First search all symtabs for one whose file contains our pc */ | |
b59661bd AC |
122 | symtab = find_pc_sect_symtab (pc, section); |
123 | if (symtab == 0) | |
fe898f56 DC |
124 | return 0; |
125 | } | |
126 | ||
127 | bl = BLOCKVECTOR (symtab); | |
fe898f56 DC |
128 | |
129 | /* Then search that symtab for the smallest block that wins. */ | |
fe898f56 | 130 | |
801e3a5b JB |
131 | /* If we have an addrmap mapping code addresses to blocks, then use |
132 | that. */ | |
133 | if (BLOCKVECTOR_MAP (bl)) | |
134 | { | |
135 | b = addrmap_find (BLOCKVECTOR_MAP (bl), pc); | |
136 | if (b) | |
137 | { | |
138 | if (pblock) | |
139 | *pblock = b; | |
140 | return bl; | |
141 | } | |
142 | else | |
143 | return 0; | |
144 | } | |
145 | ||
146 | ||
147 | /* Otherwise, use binary search to find the last block that starts | |
148 | before PC. */ | |
fe898f56 DC |
149 | bot = 0; |
150 | top = BLOCKVECTOR_NBLOCKS (bl); | |
151 | ||
152 | while (top - bot > 1) | |
153 | { | |
154 | half = (top - bot + 1) >> 1; | |
155 | b = BLOCKVECTOR_BLOCK (bl, bot + half); | |
156 | if (BLOCK_START (b) <= pc) | |
157 | bot += half; | |
158 | else | |
159 | top = bot + half; | |
160 | } | |
161 | ||
162 | /* Now search backward for a block that ends after PC. */ | |
163 | ||
164 | while (bot >= 0) | |
165 | { | |
166 | b = BLOCKVECTOR_BLOCK (bl, bot); | |
167 | if (BLOCK_END (b) > pc) | |
168 | { | |
801e3a5b JB |
169 | if (pblock) |
170 | *pblock = b; | |
fe898f56 DC |
171 | return bl; |
172 | } | |
173 | bot--; | |
174 | } | |
175 | return 0; | |
176 | } | |
177 | ||
8e3b41a9 JK |
178 | /* Return call_site for specified PC in GDBARCH. PC must match exactly, it |
179 | must be the next instruction after call (or after tail call jump). Throw | |
180 | NO_ENTRY_VALUE_ERROR otherwise. This function never returns NULL. */ | |
181 | ||
182 | struct call_site * | |
183 | call_site_for_pc (struct gdbarch *gdbarch, CORE_ADDR pc) | |
184 | { | |
185 | struct symtab *symtab; | |
186 | void **slot = NULL; | |
187 | ||
188 | /* -1 as tail call PC can be already after the compilation unit range. */ | |
189 | symtab = find_pc_symtab (pc - 1); | |
190 | ||
191 | if (symtab != NULL && symtab->call_site_htab != NULL) | |
192 | slot = htab_find_slot (symtab->call_site_htab, &pc, NO_INSERT); | |
193 | ||
194 | if (slot == NULL) | |
195 | { | |
196 | struct minimal_symbol *msym = lookup_minimal_symbol_by_pc (pc); | |
197 | ||
198 | /* DW_TAG_gnu_call_site will be missing just if GCC could not determine | |
199 | the call target. */ | |
200 | throw_error (NO_ENTRY_VALUE_ERROR, | |
201 | _("DW_OP_GNU_entry_value resolving cannot find " | |
202 | "DW_TAG_GNU_call_site %s in %s"), | |
203 | paddress (gdbarch, pc), | |
204 | msym == NULL ? "???" : SYMBOL_PRINT_NAME (msym)); | |
205 | } | |
206 | ||
207 | return *slot; | |
208 | } | |
209 | ||
fe898f56 DC |
210 | /* Return the blockvector immediately containing the innermost lexical block |
211 | containing the specified pc value, or 0 if there is none. | |
212 | Backward compatibility, no section. */ | |
213 | ||
214 | struct blockvector * | |
801e3a5b | 215 | blockvector_for_pc (CORE_ADDR pc, struct block **pblock) |
fe898f56 DC |
216 | { |
217 | return blockvector_for_pc_sect (pc, find_pc_mapped_section (pc), | |
801e3a5b | 218 | pblock, NULL); |
fe898f56 DC |
219 | } |
220 | ||
221 | /* Return the innermost lexical block containing the specified pc value | |
222 | in the specified section, or 0 if there is none. */ | |
223 | ||
224 | struct block * | |
714835d5 | 225 | block_for_pc_sect (CORE_ADDR pc, struct obj_section *section) |
fe898f56 | 226 | { |
b59661bd | 227 | struct blockvector *bl; |
801e3a5b | 228 | struct block *b; |
fe898f56 | 229 | |
801e3a5b | 230 | bl = blockvector_for_pc_sect (pc, section, &b, NULL); |
fe898f56 | 231 | if (bl) |
801e3a5b | 232 | return b; |
fe898f56 DC |
233 | return 0; |
234 | } | |
235 | ||
236 | /* Return the innermost lexical block containing the specified pc value, | |
237 | or 0 if there is none. Backward compatibility, no section. */ | |
238 | ||
239 | struct block * | |
b59661bd | 240 | block_for_pc (CORE_ADDR pc) |
fe898f56 DC |
241 | { |
242 | return block_for_pc_sect (pc, find_pc_mapped_section (pc)); | |
243 | } | |
9219021c | 244 | |
1fcb5155 DC |
245 | /* Now come some functions designed to deal with C++ namespace issues. |
246 | The accessors are safe to use even in the non-C++ case. */ | |
247 | ||
248 | /* This returns the namespace that BLOCK is enclosed in, or "" if it | |
249 | isn't enclosed in a namespace at all. This travels the chain of | |
250 | superblocks looking for a scope, if necessary. */ | |
251 | ||
252 | const char * | |
253 | block_scope (const struct block *block) | |
254 | { | |
255 | for (; block != NULL; block = BLOCK_SUPERBLOCK (block)) | |
256 | { | |
257 | if (BLOCK_NAMESPACE (block) != NULL | |
258 | && BLOCK_NAMESPACE (block)->scope != NULL) | |
259 | return BLOCK_NAMESPACE (block)->scope; | |
260 | } | |
261 | ||
262 | return ""; | |
263 | } | |
9219021c DC |
264 | |
265 | /* Set BLOCK's scope member to SCOPE; if needed, allocate memory via | |
266 | OBSTACK. (It won't make a copy of SCOPE, however, so that already | |
267 | has to be allocated correctly.) */ | |
268 | ||
269 | void | |
270 | block_set_scope (struct block *block, const char *scope, | |
271 | struct obstack *obstack) | |
272 | { | |
273 | block_initialize_namespace (block, obstack); | |
274 | ||
275 | BLOCK_NAMESPACE (block)->scope = scope; | |
276 | } | |
277 | ||
27aa8d6a | 278 | /* This returns the using directives list associated with BLOCK, if |
1fcb5155 DC |
279 | any. */ |
280 | ||
1fcb5155 DC |
281 | struct using_direct * |
282 | block_using (const struct block *block) | |
283 | { | |
27aa8d6a | 284 | if (block == NULL || BLOCK_NAMESPACE (block) == NULL) |
1fcb5155 DC |
285 | return NULL; |
286 | else | |
27aa8d6a | 287 | return BLOCK_NAMESPACE (block)->using; |
1fcb5155 DC |
288 | } |
289 | ||
9219021c DC |
290 | /* Set BLOCK's using member to USING; if needed, allocate memory via |
291 | OBSTACK. (It won't make a copy of USING, however, so that already | |
292 | has to be allocated correctly.) */ | |
293 | ||
294 | void | |
295 | block_set_using (struct block *block, | |
296 | struct using_direct *using, | |
297 | struct obstack *obstack) | |
298 | { | |
299 | block_initialize_namespace (block, obstack); | |
300 | ||
301 | BLOCK_NAMESPACE (block)->using = using; | |
302 | } | |
303 | ||
304 | /* If BLOCK_NAMESPACE (block) is NULL, allocate it via OBSTACK and | |
305 | ititialize its members to zero. */ | |
306 | ||
307 | static void | |
308 | block_initialize_namespace (struct block *block, struct obstack *obstack) | |
309 | { | |
310 | if (BLOCK_NAMESPACE (block) == NULL) | |
311 | { | |
312 | BLOCK_NAMESPACE (block) | |
313 | = obstack_alloc (obstack, sizeof (struct block_namespace_info)); | |
314 | BLOCK_NAMESPACE (block)->scope = NULL; | |
315 | BLOCK_NAMESPACE (block)->using = NULL; | |
316 | } | |
317 | } | |
89a9d1b1 DC |
318 | |
319 | /* Return the static block associated to BLOCK. Return NULL if block | |
320 | is NULL or if block is a global block. */ | |
321 | ||
322 | const struct block * | |
323 | block_static_block (const struct block *block) | |
324 | { | |
325 | if (block == NULL || BLOCK_SUPERBLOCK (block) == NULL) | |
326 | return NULL; | |
327 | ||
328 | while (BLOCK_SUPERBLOCK (BLOCK_SUPERBLOCK (block)) != NULL) | |
329 | block = BLOCK_SUPERBLOCK (block); | |
330 | ||
331 | return block; | |
332 | } | |
1fcb5155 DC |
333 | |
334 | /* Return the static block associated to BLOCK. Return NULL if block | |
335 | is NULL. */ | |
336 | ||
337 | const struct block * | |
338 | block_global_block (const struct block *block) | |
339 | { | |
340 | if (block == NULL) | |
341 | return NULL; | |
342 | ||
343 | while (BLOCK_SUPERBLOCK (block) != NULL) | |
344 | block = BLOCK_SUPERBLOCK (block); | |
345 | ||
346 | return block; | |
347 | } | |
5c4e30ca DC |
348 | |
349 | /* Allocate a block on OBSTACK, and initialize its elements to | |
350 | zero/NULL. This is useful for creating "dummy" blocks that don't | |
351 | correspond to actual source files. | |
352 | ||
353 | Warning: it sets the block's BLOCK_DICT to NULL, which isn't a | |
354 | valid value. If you really don't want the block to have a | |
355 | dictionary, then you should subsequently set its BLOCK_DICT to | |
356 | dict_create_linear (obstack, NULL). */ | |
357 | ||
358 | struct block * | |
359 | allocate_block (struct obstack *obstack) | |
360 | { | |
361 | struct block *bl = obstack_alloc (obstack, sizeof (struct block)); | |
362 | ||
363 | BLOCK_START (bl) = 0; | |
364 | BLOCK_END (bl) = 0; | |
365 | BLOCK_FUNCTION (bl) = NULL; | |
366 | BLOCK_SUPERBLOCK (bl) = NULL; | |
367 | BLOCK_DICT (bl) = NULL; | |
368 | BLOCK_NAMESPACE (bl) = NULL; | |
5c4e30ca DC |
369 | |
370 | return bl; | |
371 | } |